The problem is the Big Publishing Houses are on an anti-library kick so there is no guarantee Public Libraries will be able to keep on offering new ebooks on current terms, if at all.
Interestingly enough, if Amazon can document that lending libraries improve ebook *sales* they might get the BPHs to relent on their library obsession.
Failing that, the only ebook libraries with contemporary content might end up being Amazon's and any emulators.